Who discovered the proton?
Crookes
Rutherford
Balten
Chadwick

Sir James Chadwick discovered proton  

Explanation:

Sir James Chadwick,  was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. In 1941, he wrote the final draft of the MAUD Report, which inspired the U.S. government to begin serious atomic bomb research efforts.

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